Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang
文献类型：期刊论文
| 作者 | Chen, Jing-Yuan1,2; Yang, Jin-Hui1,3; Zhang, Ji-Heng3; Zhu, Yu-Sheng1 |
| 刊名 | LITHOS
 |
| 出版日期 | 2021-11-15 |
| 卷号 | 402页码:18 |
| 关键词 | High silica granite Crystal mush Magmatic enclaves Crystal accumulation Melt segregation |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2021.106012 |
| 英文摘要 | The Cretaceous granitoids in eastern Zhejiang were examined to establish a model for the construction of the highly silicic upper crust in southeastern China. The studied rocks include quartz monzodiorite, quartz monzonite, alkali feldspar granite, and their microgranular enclaves (ME). Zircon U-Pb dating suggests that the granitic rocks and MEs were emplaced at approximately 102-114 Ma. Geochemical features and isotopic compositions of the quartz monzodiorite, quartz monzonite, and alkali feldspar granite indicate that they are mainly produced by the partial melting of Neoproterozoic to Mesoproterozoic crustal rocks. The quartz monzodiorites, quartz monzonites, and alkali feldspar granite appeared to derive from a similar silicic magma reservoir because they have comparable crystallization age, zircon trace element variation trend, Sr-, Nd-, and Hf-isotopic compositions, and complementary geochemical compositions. The studied quartz monzodiorites, quartz monzonites, and low silica alkali feldspar granites (SiO2 < 75 wt%) are deemed a residual cumulate according to their geochemical compositions and textural features (e.g., aggregates of coarse-grained euhedral plagioclase crystals in "glomeroporphyritic aggregates"), whereas the high silica alkali feldspar granites (SiO2 > 75 wt%) resemble frozen remnants of high silica melts segregated from a crystal mush because they are highly enriched in SiO2 and depleted in Ba, Sr, and Eu. The MEs hosted in the quartz monzodiorites and quartz monzonites have low SiO2 and high MgO contents, high initial Sr-87/Sr-86 ratio and negative epsilon(Nd)(t) and epsilon(Hf)(t) values, and variable zircon delta O-18 and epsilon(Hf)(t) values. Petrographic observations and geochemical features suggest that they are formed from solidified mafic magmas and generated by the crystal fractionation of mantle-derived hydrous mafic magma with subsequent crustal contamination. Compared with these mafic MEs, the MEs hosted by the alkali feldspar granites have relatively high SiO2 and low K2O contents, indicating that the felsic MEs are generated by crystal fractionation of the parental magma of the mafic MEs. Since abundant MEs occurred in the quartz monzodiorites, quartz monzonites, and alkali feldspar granites, magma recharge may have promoted the extraction and upward percolation of high silicic melts from the compacting crystal-rich mush in the shallow crust. Thus, the chemical and lithological diversity of the granitic plutons in eastern Zhejiang is generated in the upper crust via crystal melt segregation. Specifically, the quartz monzonites and quartz monzodiorites are formed as residual cumulate, whereas the high silica alkali feldspar granites are generated as frozen remnants of high silicic melts segregated from a compacting crystal mush. More widely, our work suggests that the formation of the highly silicic upper crust in southeastern China is controlled by crystal-melt segregation processes in the shallow crust. (C) 2021 Elsevier B.V. All rights reserved. |
| WOS关键词 | ZIRCON U-PB ; HF ISOTOPIC CONSTRAINTS ; A-TYPE GRANITES ; SOUTH CHINA ; SE CHINA ; CRYSTAL ACCUMULATION ; ELDORADO MOUNTAINS ; CONTINENTAL-CRUST ; PLUTONIC COMPLEX ; COASTAL REGION |
| 资助项目 | National Natural Science Foundation of China[42073033] ; Chinese Ministry of Science and Technology[2012CB416702] ; Fundamental Research Funds for the Central Universities[300102279102] ; Fundamental Research Funds for the Central Universities[Y95401DXX2] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000713001200006 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/103797]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Chen, Jing-Yuan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China 2.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Jing-Yuan,Yang, Jin-Hui,Zhang, Ji-Heng,et al. Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang[J]. LITHOS,2021,402:18. |
| APA | Chen, Jing-Yuan,Yang, Jin-Hui,Zhang, Ji-Heng,&Zhu, Yu-Sheng.(2021).Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang.LITHOS,402,18. |
| MLA | Chen, Jing-Yuan,et al."Construction of a highly silicic upper crust in southeastern China: Insights from the Cretaceous intermediate-to-felsic rocks in eastern Zhejiang".LITHOS 402(2021):18. |
入库方式： OAI收割
来源：地质与地球物理研究所
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